42 lines
1.2 KiB
Plaintext
42 lines
1.2 KiB
Plaintext
{ (define LIBNAME "Directories")
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(include "head.tinc") }
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<p>The teachpack <code>dir.ss</code> provides two-structures and one
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operation:
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<menu>
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<li> <code>(define-struct dir (name dirs files))</code>
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<li> <code>(define-struct file (name size content))</code>
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<li> <code>{(idx create-dir)}</code> which consumes a directory path (a string)
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and produces a directory.
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</menu>
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<p>The teachpack relies on two data definitions:
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<menu>
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<li>
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A Directory is
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<code>({(idx make-dir)} string[path] (listof Directory) (listof File))</code>
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<li>
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A File is <code>({(idx make-file)} String PositiveNumber (listof Char))</code>
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</menu>
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Sample: Set teachpack to <code>dir.ss</code> and execute. Then evaluate
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<pre>
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> (create-dir ".")
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(make-dir
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'|.|
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empty
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(cons (make-file 'ball1.gif 1289 empty)
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(cons (make-file 'blueball.gif 205 empty)
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(cons (make-file 'greenbal.gif 204 empty)
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(cons (make-file 'redball.gif 203 empty)
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(cons (make-file 'ufo.gif 1044 empty)
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(cons (make-file 'gif-test.ss 5811 empty)
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empty)))))))
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</pre>
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<p>Note: Softlinks are always treated as if they were empty files.
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{(include "foot.tinc")}
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